Schneider Electric IMD-IM20 IMD-IM20 Isolation monitor No. of relay outputs: 1

This device belongs to the Vigilohm series, which was developed for the monitoring of ungrounded power supplies (IT systems) according to the installation and product standards. According to the standards, it is recommended to equip your systems with insulation monitoring devices (IMD). This equipment is intended for monitoring medium size AC, DC and ACDC systems with limited interference. It measures the line insulation resistance by feeding a low frequency alternating current between the mains and the ground. The configuration depends on the installation. The settings are made on the front of the device via the HMI screen. The alarm thresholds can be set from 0.5 kOhm to 500 kOhm and alarm delays of 0 to 7200 seconds. It monitors networks up to 600 VAC when connected to the neutral wire, 480 V when connected to the line and 345VDC, with up to 70 microfarad. The black and white screen displays the insulation resistance from 100 ohms to 10 megaohms, the capacity and temporary errors. Autotest starts automatically every 5 hours and if necessary. If the insulation resistance of the system falls below the set threshold value, i.e. if there is a ground fault, an alarm is triggered via the IMD output relay. As soon as no more faults are detected, the alarm is cleared and the alarm relay returns to its normal state. The device can be supplied from a 110VAC to 415VAC source or a 125VDC to 250VDC source, all with a tolerance of plus or minus 15%. This product can be mounted on a DIN rail or flush and also has a lock input. Front-side protection class is IP52, rear side of IP20 and overvoltage category III. The monitoring device is equipped with an RS485 communication interface with Modbus protocol.

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